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LogFactory.java

/*
 Copyright (c) 2002, 2010, Oracle and/or its affiliates. All rights reserved.
 

  The MySQL Connector/J is licensed under the terms of the GPLv2
  <http://www.gnu.org/licenses/old-licenses/gpl-2.0.html>, like most MySQL Connectors.
  There are special exceptions to the terms and conditions of the GPLv2 as it is applied to
  this software, see the FLOSS License Exception
  <http://www.mysql.com/about/legal/licensing/foss-exception.html>.

  This program is free software; you can redistribute it and/or modify it under the terms
  of the GNU General Public License as published by the Free Software Foundation; version 2
  of the License.

  This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
  without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  See the GNU General Public License for more details.

  You should have received a copy of the GNU General Public License along with this
  program; if not, write to the Free Software Foundation, Inc., 51 Franklin St, Fifth
  Floor, Boston, MA 02110-1301  USA



 */
package com.mysql.jdbc.log;

import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;
import java.sql.SQLException;

import com.mysql.jdbc.ExceptionInterceptor;
import com.mysql.jdbc.SQLError;

/**
 * Creates instances of loggers for the driver to use.
 * 
 * @author Mark Matthews
 * 
 * @version $Id$
 */
00042 public class LogFactory {

      /**
       * Returns a logger instance of the given class, with the given instance
       * name.
       * 
       * @param className
       *            the class to instantiate
       * @param instanceName
       *            the instance name
       * @return a logger instance
       * @throws SQLException
       *             if unable to create a logger instance
       */
00056       public static Log getLogger(String className, String instanceName, ExceptionInterceptor exceptionInterceptor)
                  throws SQLException {

            if (className == null) {
                  throw SQLError.createSQLException("Logger class can not be NULL",
                              SQLError.SQL_STATE_ILLEGAL_ARGUMENT, exceptionInterceptor);
            }

            if (instanceName == null) {
                  throw SQLError.createSQLException(
                              "Logger instance name can not be NULL",
                              SQLError.SQL_STATE_ILLEGAL_ARGUMENT, exceptionInterceptor);
            }

            try {
                  Class loggerClass = null;

                  try {
                        loggerClass = Class.forName(className);
                  } catch (ClassNotFoundException nfe) {
                        loggerClass = Class.forName(Log.class.getPackage().getName()
                                    + "." + className);
                  }

                  Constructor constructor = loggerClass
                              .getConstructor(new Class[] { String.class });

                  return (Log) constructor.newInstance(new Object[] { instanceName });
            } catch (ClassNotFoundException cnfe) {
                  SQLException sqlEx = SQLError.createSQLException(
                              "Unable to load class for logger '" + className + "'",
                              SQLError.SQL_STATE_ILLEGAL_ARGUMENT, exceptionInterceptor);
                  sqlEx.initCause(cnfe);

                  throw sqlEx;
            } catch (NoSuchMethodException nsme) {
                  SQLException sqlEx = SQLError
                              .createSQLException(
                                          "Logger class does not have a single-arg constructor that takes an instance name",
                                          SQLError.SQL_STATE_ILLEGAL_ARGUMENT, exceptionInterceptor);
                  sqlEx.initCause(nsme);

                  throw sqlEx;
            } catch (InstantiationException inse) {
                  SQLException sqlEx = SQLError.createSQLException(
                              "Unable to instantiate logger class '" + className
                                          + "', exception in constructor?",
                              SQLError.SQL_STATE_ILLEGAL_ARGUMENT, exceptionInterceptor);
                  sqlEx.initCause(inse);

                  throw sqlEx;
            } catch (InvocationTargetException ite) {
                  SQLException sqlEx = SQLError.createSQLException(
                              "Unable to instantiate logger class '" + className
                                          + "', exception in constructor?",
                              SQLError.SQL_STATE_ILLEGAL_ARGUMENT, exceptionInterceptor);
                  sqlEx.initCause(ite);

                  throw sqlEx;
            } catch (IllegalAccessException iae) {
                  SQLException sqlEx = SQLError.createSQLException(
                              "Unable to instantiate logger class '" + className
                                          + "', constructor not public",
                              SQLError.SQL_STATE_ILLEGAL_ARGUMENT, exceptionInterceptor);
                  sqlEx.initCause(iae);

                  throw sqlEx;
            } catch (ClassCastException cce) {
                  SQLException sqlEx = SQLError.createSQLException("Logger class '"
                              + className + "' does not implement the '"
                              + Log.class.getName() + "' interface",
                              SQLError.SQL_STATE_ILLEGAL_ARGUMENT, exceptionInterceptor);
                  sqlEx.initCause(cce);

                  throw sqlEx;
            }
      }
}

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